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<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
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<body>
    <!-- 将字符串"i come from beijing"倒置，即控制台输出"beijing from come i"

语句直接写在程序中，不需要用户输入 -->
    <script>
        var str = "i come from beijing";
        var arr = [];
        arr.push(str.slice(-7));
        arr.push(str.slice(7,11));
        arr.push(str.slice(2,6));
        arr.push(str.slice(0,1));
        var str1 = arr.join(" ");
        console.log(str1);
    </script>
</body>
</html>